forked from Mirrors/opensbi

We add a new FDT based ACLINT MTIMER driver which works for both CLINT device and standalone ACLINT MTIMER device. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Xiang W <wxjstz@126.com>